How do i make these parts of my model smoother and less discolored?
You should avoid triangle faces, especially where you need smooth curved surfaces. Use quads instead.  

I fixed your model's normals to make it renderable but it won't be perfect...

You can solve some shading issues changing the blue edges back to normal. The blue edges are marked as sharp, this means they won't be smoothed. Some of them have been marked by mistake so you'll have to check.
This is how to "unmark" them :

In edit mode
1- change your selection mode to edge
2- select your edges and use Ctrl+E to open Edge menu
3- click on clear sharp